Plate support for color-projection machines



Aug. 6, 1929.

A. J. OBERG ET AL PLATE SUPPORT FOR COLOR PROJECTION MACHINES FiledAug.l8, 1928 N E TOR-i A 1 0/1 die/57 /r/ Indy/22?, Shel? BY ATTORNEY.

Patented Aug. 6, 1929.

' UNITED STATES PATENT OFFICE.

ANTON J. OBERG AND ROBERT STOEFEN, OF LOS ANGELES, CALIFORNIA.

PLATE SUPPORT FOR COLOR-PROJECTION MACHINES.

Application filed August 18, 1928. Serial No. 300,500.

This invention relates to improved means for supporting the plates ofcolor projecting machines and for propelling said plates, also toimproved means for holding in place between transparent plates anintermediate colored plate.

An object of the invention is to support the intermediate colored plateor plates in simpler or more eflicient manner.

Another object of theinvention is to provide improved means for minglingwhite light with colored light in such a manner as to produce novel andmore attractive spotlight effects. I

Still another object of the invention is to produce simpler and moredependable means for rotating the colarprojecting plate in combinationwith simplified means, for supporting said plate and guiding it duringits rotary movement.

Other objects and advantages may hereinafter ap ear.

Referring to the accompanying drawings which illustrate a preferredembodiment of the invention,

Figure 1 is a front view of spotlight color wheel embodying theinvention and illustrating also the means for rotating said wheel. andfor guiding its rotational movement.

Figure 2 is a partial cross section, the line of section being indicatedby the line 2-2 of Figure 1.

Referring in detail to the drawings, our newly invented spotlight colorwheel includes a central glass disk 5 having a plurality of coloredsectors 6, the color of each sector being diiierent from the colors ofadjacent sectors. Along the margin. of each sector is provided aplurality of preferably semi-circular transparent spots 7 beingdistributed in any suitable manner to cause white light to mingle withcolored light when the disk is rotated.

Against one side of the central colored disk 5 is fitted a transparentretaining disk 8 and against the other side thereof is fitted a 00-operating transparent retaining disk 9. Around the three disks 5, 8, and9 extends a supporting ring 10 having a keeper flange 11 on one sidewhich abuts against the outer face of disk 8 and nearits other side agroove 12 within which is seated a resilient, nearly complete ring 13which retains the disk 9 in place. Each of the free ends of said ring isprovided with an inwardly bent finger-hold let to aid in manuallyremoving and replacing the ring 13.

On ring 10 is provided a peripheral toothed portion 15 with whichcooperates a toothed pinion 16 secured to the driving shaft 17. Saiddriving shaft 17 is supported by a hearing 18.

The retaining ring 10 is provided at about its mid-width with anexternal peripheral groove 20 with which. cooperates a guidin wheel ordisk 21 loosely mounted on the en portion of shaft 17 and held in placeupon said shaft by a nut 22 secured to the outer end of said shaft.WVithin disk 21 is a bushing sleeve 23. A washer 24. is interposedbetween nut 22 and theou'ter end of said sleeve, said washer aiding inretaining the rotatable wheel 21 in place.

At each side of the main rotary element is mounted an auxiliary guidingdisk or wheel 25 which is supported on an auxiliary shaft 26 said guidewheels 25 also engage the groove 20 of ring 10.

In the embo-dimentof the invention illustrated in the drawings thecolored disk 5 is illustrated as being made up of a series ofdilferently colored areas or segments 6 which are grouped around acentral set of colored areas 6, the four last mentioned colored areasbeing each of a triangular shape and being so arranged as to form asquare.

It is to be understood that the invention is by no means limited to anyparticular grouping or arrangement of the areas of colored glassprovided in order to produce the desired color effect. Variously sha 36dfragments of glass plates maybe placed etween the outer plates 8 and 9and securely retained in place by means of the annular flange 11 and there taining ring 13 which'cooperates therewith.

In the illustrated embodiment of the inven tion the pieces 6 and 6 ofdifferently colored glass which comprise the intermediate disk 5. aresymmetrically shaped and are fitted to each other along their margins,being cut away at their edges to form the uncolored spots 7 I Owing tothe fact that the uncolored spots 7 are semi-circular in shape and arelocated in the edge portions of the glass plates which form thecomponent parts of the colored glass disk 5, said uncolored spots may bereadily provided for by grinding away an edge pertion of a plateWherever it is desired to form an uncolored spot, the grinding Wheelused for this purpose sing reiatively narrow and having its peripheryconv Bled from side to side to iit into the completed semi-circularcut-away portions.

The operation Will be readily understood from the foregoing descript'on.ihe toothed pinion 16 carried by tie drivin shaft 17 imparts rotarymovement LO the supporting ring;

lO'tonether with glass eien'ients carried th eby be no; guided and keptonal movement not 21 therebeneath, but de Wheels 25.

in place oniy by vVe claim:

1. In a devic to transmit colii enoage each side ring encircling all ofseit circmnferentiai rota k and an in al groove near th other side, aretaining 112? to engage said plates in lace Wit in said SflppOTtiIlfl adrive sl' t, a pinion mounted on said shaft and operatively said ring;to rotate the iatter, said ring havin an nernal circumferential groove,and a guide disk mounted on shaft and said groove.

, d iingle tincolored light with colored light,the spots uncolored lightthus provided being night on one side and curved on the opposite side. 1

In testimony whereof We affix our signatures.

colorc r light, and means to rotate said disk to ANTON J. OBERG. ROBERTR. STOEFEN.

